A 75-year-old mystery has been solved, and the families of 80 American sailors lost at sea will now have closure: the U.S.S. Grayback has finally been found. It was hidden from discovery all this time by a single errant digit.

What happened to us submarine Grayback?

The USS Grayback sank in February 1944 after Japanese forces attacked it as the sub was on a mission in the East China Sea. The sub had sunk 21,594 tons of shipping on its final mission alone, and overall, the submarine is credited with sinking 14 ships at 63,835 tons, according to the Navy.

Who found the USS Grayback?

The U.S.S. Grayback, one of WWII's most successful U.S. submarines, was discovered 1,400 feet below sea level off the coast of Okinawa, Japan, by explorer Tim Taylor and his team on June 5, according to multiple news outlets. The discovery became public on Sunday, just one day before Veteran's Day.